All right, so let's take a trip down Memory Lane, shall we?
~First there were the people that thought Luxray GL LV.X should be banned.
~Then there were the people that thought Vileplume UD should be banned.
~Then there were the people that thought Lost World should be banned.
~Then there were the people that thought Sableye should be banned.
~Now there are the people that think that Pokemon Catcher should now be banned.
Out of those, Sableye is the only reasonable argument, because of the Black/White rule change (Sableye was never meant to exist in a ruleset where T/S/S could be played T1). And, there is actually something being done about that.
But, what it really comes down to is that people are either scared of, and/or they hate, a certain card that causes them frustration. And, they want to vent their frustration by claiming it should be banned/not printed in the US. The thing is, if you don't think we should have it, why is Japan playing with the card still? The format's virtually the same - by the time Pokemon Catcher is released, we'll have the HGSS-on rotation already.
So seriously, guys - it's just a card. Get over it.
~~~
By the way, for the people that say you don't need Catcher in Blastoise: That's true, but virtually all decks will be running Catcher just to drag up something with giant retreat cost, not just to bring up something you're within range of killing.